<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr />
    <textarea placeholder="请输入评论（最多120字）" maxlength="120" v-model="msg"></textarea>
    <mt-button type="primary" size="large" @click="postComment()">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
        <div
          class="cmt-title"
        >第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_id }}&nbsp;&nbsp;发表时间：{{ item.add_time | dataFormat }}</div>
        <div class="cmt-body">{{ (item.content === 'undefined') ? '此用户很懒，什么都没说' : item.content }}</div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getMore()">加载更多</mt-button>
  </div>
</template>

<script>
import { Toast } from "mint-ui";

export default {
  data() {
    return {
      pageIndex: 1,
      comments: [],
      msg: ''
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    getComments() {
      this.$axios
        .get('api/getcomments/' + this.id + '?pageindex=' + this.pageIndex)
        .then(response => {
          if (response.data.status === 0) {
            this.comments = this.comments.concat(response.data.message);
          } else {
            Toast('获取评论失败');
          }
        });
    },
    getMore() {
      this.pageIndex++;
      this.getComments();
    },
    postComment() {
      if (this.msg.trim().length === 0) {
        return Toast('评论内容不能为空');
      }
      this.$axios
        .post('api/postcomment/' + this.id, {content:this.msg.trim()})
        .then(response => {
          if (response.data.status === 0) {
            var cmt = { user_name:'匿名用户', add_time:Date().now, content:this.msg.trim() };
            this.comments.unshift(cmt);
            this.msg = '';
          }
        })
    }
  },
  props: ['id']
};
</script>

<style lang="scss">
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 5px 0;
  }
  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        background-color: #ccc;
        line-height: 30px;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>